来自姜占华的问题
Thetrainwentthrough________180-metre-longtunnel（隧道）at________highspeed．（）A.a；aB.an；/C.an；theD.a；/
The train went through ________ 180-metre-long tunnel（隧道）at ________ high speed．（）
A.a； a
B.an；/
C.an； the
D.a；/
